High pitch whine with boost!!
08-03-2007, 01:30 PM
#16
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Check your left lower intercooler boot. On my 2001, it was in contact with the inner fender and eventually rubbed a hole in the boot. Anything over 20psi and it would scream like a whistling bottle rocket. Had to replace the boot and modify the inner fender with a hammer so they would no longer rub.
08-03-2007, 03:59 PM
#17
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Mine only worked with a load, "boost". When sitting still, or in neutral it does not do it. No matter how high I rev. But as soon as boost gets up to about 5psi, it starts. nothing to do with being warm either
08-04-2007, 02:29 PM
#18
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found the prob. Loose intake bolt. It was the very rear driver side one that has the wire bundle clip attached to it. Would explain why it was so loud in the cab
09-18-2007, 05:59 PM
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Mine just started doing this after reinstalling my stock turbo. I guess I'm gonna have to check all the bolts and hose clamps. It is a gear type of howl that increases exactly as the turbo whistle does. Truck still runs fine but it's irritating....
07-15-2016, 12:09 AM
#20
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Can anyone recall what might have been the culprit? Truck runs excellent, just has loud turbo whine inside the cab above 5psi boost (cold or warm doesn't matter).
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